tree 6494ae5426a54a98ad5f8f6aec4ba58e41003fc4
parent 15f7fc060a7bf49991c35b23e1e7d73a1535382a
author Brian King <brking@linux.vnet.ibm.com> 1276800913 -0500
committer James Bottomley <James.Bottomley@suse.de> 1280250159 -0500

[SCSI] ibmvfc: Fix soft lockup on resume

This fixes a softlockup seen on resume. During resume, the CRQ
must be reenabled. However, the H_ENABLE_CRQ hcall used to do
this may return H_BUSY or H_LONG_BUSY. When this happens, the
caller is expected to retry later. Normally the H_ENABLE_CRQ
succeeds relatively soon. However, we have seen cases where
this can take long enough to see softlockup warnings.
This patch changes a simple loop, which was causing the
softlockup, to a loop at task level which sleeps between
retries rather than simply spinning.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>